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gtest uses __cplusplus value to detect whether C++11 features are available.
However, some of Windows bots has smaller value that C++11 spec defines.
That makes gtest fallback to pre-C++11 mode unnecessarily.
This CL adds GTEST_LANG_CXX11 to force gtest use C++11 mode.

BUG=630299

Review-Url: https://codereview.chromium.org/2174213002
Cr-Commit-Position: refs/heads/master@{#407408}